Stretching mechanism for stretching textile fibers for mules, ring spinning, and stretching machines



A. AEBERLI 2,045,338

June 23, 1936. STRETGHING MECHANISM FOR STRETCHING TEXTILE FIBERS FORMULES, RING SPINNING, AND STRETCHING MACHINES Filed Dec 22, 1953Patented June 23, 1936.

STRETCHING MECHANISM'FOR STRETCH- ING TEXTILE FIBERS FOR MULES, RINGSPINNING, AND STRETCHING MACHINES.

Arnold Aeberli, Zurich, Switzerland Application December 22, 1933,Serial No. 703,612 In Switzerland January 2, 1933 6 Claims.

' This invention relates to a stretching mechanism for stretchingtextile fibers for mules, ring spinning and stretching machines,consisting substantially of two stretching cylinders mounted in sideplates connected by a cross piece and a clearer roller, said stretchingcylinders being in positive rotary connection with one another by meansof a driving element.

In the known stretching mechanisms of this type the cross-sectionalreduction of the stretch ing cylinders at the points, at which they jointhe journals, is entirely without transition. The stretching cylindersextend at both sides very close to the side plates, so that only anarrow gap remains at each side between these plates and the end facesof the stretching cylinders. Moreover, the side plates serving asbearings for the stretching cylinders in the known stretching mechanismsof the type in question are constructed in such a manner that thestretching cylinders laterally cover the side plates almost entirely,that is approximately within the range of the whole end faces. V

It has been found, that the dust and spinning fly penetrate into thenarrow gaps between the side plates and the end faces of the stretchingcylinders and winds -on the journals, whereby jammings are caused, whichmay lead to irregularities in the circumferential speed of thestretching cylindersor even to stopping thereof.

-In thestretching mechanism according to the invention these and otherobjections are overcome in that the stretching cylinders are fitted atboth ends with a neck tapering towards the journals and that each of theside plates are so constructed that the lower edge of each side plateintersects the bores for accommodating the stretching cylinder journalsso that the bores are open in downward direction, at least one journalof each stretching cylinderrbeing axially shiftable and held inoperative position by resilient means. I

An embodiment of the invention is illustrated by way of example in theaccompanying drawing, in which:-

Fig. 1 shows in rear elevation the stretching mechanism viewed in thedirection of the arrow I of Fig. 3. I

Fig. 2 is a front view of the mechanism.

Fig. 3 is a side elevation of Fig. 1.

Fig. 4 shows the stretching mechanism in cross section taken on thelongitudinal central plane II of Fig. 1.

Fig. 5 is a. cross section on line IIII of Fig. 1.

Fig. 6' is a detail.

Fig. 7 shows a stretching cylinder partly in longitudinal section and ona larger scale.

. Fig. 8 is a view of a modified form of stretching cylinder.

In the drawing two side plates I are connected by a transverse piece 2.Stretching cylinders 3 and 4 are journalled in the side plates l, thecylinder 4 having a fluted surface. l3 and i3 designate two rearcylinders and i4, I4 two front cylinders. I5 is the fiber band to bestretched. It enters the stretching mechanism at B and leaves it at C.

The stretching cylinders 3, 4 have necks 5, 6 respectively each'taperingtowards the coordinate journal. The side plates are'formed with recessesconstituting sockets or bearings it) and it) which open through thelower edges 1 of the side plates and receive the journals 8 and 9 of thecylinders. By having the bearings formed with the restricted mouths attheir lower ends as shown in Figure 3, the journals8 and 9 will beprevented from slipping out of the bearings but the bearings can becleaned without it being plates I or from the bores therein by inwardlypressing this shiftable journal 9.

The bores ID of the stretching cylinder 3 as shown in Figure 3 areelongated transversely of the side plates whereby the cylinder 3 can beshifted in its bearings and maintained in paral- 3 lel relation to thefluted cylinder 20. By this arrangement, the fibers will be guided andmaintained under uniform pressure, this being of great important for theproduction of first class uniform material. Shifting of the cylinder 3away from the cylinder 4 will also tighten the belt II which impartsrotary motion from one cylinder to the other;

The stretching cylinders 3, 4 have each a portion l2, l2 respectivelyor" oval cross section for accommodating the driving belt I I. Thedriving belt II is stretched over the cylinders 3 and 4 so that throughthe driving of the cylinder 4 the cylinder 3 is also driven. Thestretching cylinders rest on a fluted cylinder 20 which drives thelikewise fluted stretching cylinder 4. It will be observed that thecylinders 3 and 4 are arranged on opposite sides of a plane passingvertically through the axis of the cylinder 20 and in alinement withsaid axis. Because of this arrangement, these rollers tend to movedownwardly over the surface of the cylinder 20 and thus to separate andstretch the belt II, the bearings for the cylinder 3 being shaped topermit such separation. In the case of very long stretching cylinders 3,4, two driving belts are preferably employed, which each run on one ofthe turned portions of oval cross section of its stretching cylinder. Acylinder so formed is illustrated in Fig. 8.

V A clearer roller I6 bearing merely on the fluted stretching cylinder 4exerts by gravity at the same time also a loading effect :on the drivingelement I I stretching the same and maintaining the element II undersuch tensionas to rotate the stretching cylinders under constant drivinga nut 20' for adjusting the position of the'device in the machine frameand on the fluted cylinder 20, so as-to lengthen or -.-shorten:.theclamping distance as desired. The stretching mechanism is therefor somounted that its frame together with the pressure cylinders and the.clearerrOlier will be shiftable backwards and forwards as a completeunit and adapted to be removed from the machine frame like an ordinaryupper cylinder.

By the arrangement of the necks gradually tapering towards the journalsjamming, owing to the spinning fly, is avoided. "The freeing .of agreatportion of the end faces of the stretching cylinders due to theraised edges I of the side plates I also renders it diificult for thespinning fly to collect. Moreover, asalready'mentioned, cleaning isgreatly facilitated at the bearing points open in downward direction,.and as the spinning fly cannot collect, electromagnetic. currentsbetween the rotating parts are avoided.

Owing ,to the axial shiftability .of .aJournal of each stretchingcylinder these cylinders can be easily inserted and removed.

The fluting of one stretching cylinder 4 advantageously increases theadhesion between this cylinder and the fluted cylinder 29 and thereforeexerts a very favorable effect on the drawing in of the fibre band I5.The adhesion between the stretching cylinder ,4 and the flutedcylinderid is still further increased by the. clearer roller It arrangedabove the stretching cylinder 4 and pressing by gravity on to thestretching cylinder. It is thus possible, to obtain a preliminaryretardation between the pair .of pulling in'cylinders I3, I3 and thestretching cylinder 4 and the fluted cylinder 20, an'd to distort-the sc-called twister in.

Reference has beencma'de to stretchable'belts II of known type.'Stretchable rubber belts are satisfactory in some climates but wheretheolimateis suchasto 5 affectrubber injuriously, well known spiral wirebelts may be employed-and of course the inventor does not wish to belimited with respect to the type of belt employed.

I claim:-

1. Stretching mechanism for stretching textile fibers for mules, ringspinning and stretching machines, comprising in combination two sideplates having recesses formed therein constituting sockets, a transverseframe rigidly connecting said side plates, two stretching cylinders, anda clearer cylinder journaled in said side plates, 2. driving elementadapted to rotate said stretching cylinders, journals one on each end ofeach of said stretching cylinders journalled in the sockets of said sideplates and one of said journals being axially shiftable, a tapered neckon each end of each of said stretching cylinders tapering towards its,coordinatejournal and providing clearance between the cylinders and theinner faces of the side plates, the sockets for accommodating saidstretching cylinders having restricted mouths opening through the lower,edges of the-side plates, and. resilient means adapted to maintain saidaxially shiftable journal in operative position.

2. A stretching mechanism as specified in claim 1, comprising incombination with the side plates, the stretching cylindersand thedriving element, a pressure roller on which rests said stretchingcylinders, an endless belt forming said driving element, certain of saidsockets being elongated transversely of the side plates, and one of saidstretching cylinders being displaceable in the elongatedsockets tochange the distance between this cylinder and the other stretchingcylinder and accommodate itself to the fibre band, and at the same time.to stretch said belt.

3 A stretching mechanism as specified. in :claim 1, in'which the sideplates, the stretching cylinders and the clearer rollerform a completeunit adapted to :be shifted backwards ;.and forwards inand to beinsertedand removed-from themachine :frame like an ordinaryuppercylinder.

4. :A stretching mechanism as specified inclaim 1, comprising incombination .withitheistretching cylinders, -the.;clear erroller andtheside plates, which all together forma complete unit,a-flute,dcylinder under said stretching cylinders, outwardly extendingprojections gon-said ,side plates, adjusting screws, and adjusting'nutsrun each of said projections adapted to. adjustthepositionof said unit.in the macln'ne frame and ,on said; fluted cylinder to varying theclamping .distanceas -.desired.

5. Astretching mechanismasspecified in claim 1,. in which saidstretching. cylindershaveeach a turned extensionof oval..cr0ss sectionand said I driving :elementv comprises. two endless. belts each runningon one extension of saidstretching cylinders.

:6. A.-.stretching mechanismaszclaimed. in claim 1, comprising .incombination withuside :plates, clearer roller and .stretchingcylinders,a. driving element in the form of an endless belt, said clearer rollerresting partly. on one of =Saidstretching. .cylitHdBIS and partly on thebelt to effect stretching said belt, said side plates havingcup-likelongitudinal slots, hemispherical :ends on :said clearer rollerengaging in such slots, sa-id .slots'ibeing milled to correspond to theradius of thetendsr of said clearer. roller.

ARNOLD AEBERLI.

